TY  - JOUR
T1  - Trends in voluntary group membership: Comments on Baumgartner and Walker
AU  - Smith, Tom W.
PY  - 1990
SP  - 646
EP  - 661
JO  - American Journal of Political Science
VL  - 34
IS  - 3
SN  - 0092-5853
UR  - http://www.jstor.org/stable/2111392
ER  -